JSON 序列化一个类并使用 Python 更改属性大小写 [英] JSON serialize a class and change property casing with Python

问题描述

我想创建一个类的 JSON 表示并自动将属性名称从 snake_case 更改为 lowerCamelCase，因为我想遵守 PEP8Python 和 JavaScript 命名约定(也许更重要的是，我要与之通信的后端使用 lowerCamelCase).

我更喜欢使用标准的 json 模块，但我不反对使用另一个开源库(例如 jsonpickle 可能会解决我的问题?).

<预><代码>>>>类硬件配置文件:... def __init__(self, vm_size):... self.vm_size = vm_size>>>hp = HardwareProfile('大')>>>hp.vm_size'大'### ### 我想要的是 ### ###>>>magicjson.dumps(hp)'{"vmSize": "大"}'### ### 到目前为止我所拥有的...... ### ###>>>json.dumps(hp, default=lambda o: o.__dict__)'{"vm_size": "大"}'

解决方案

您只需要创建一个函数，将snake_case 键转换为camelCase.您可以使用 .split、.lower 和 .title 轻松做到这一点.

导入json类硬件配置文件:def __init__(self, vm_size):self.vm_size = vm_sizeself.some_other_thing = 42self.a = 'a'def snake_to_camel(s):a = s.split('_')a[0] = a[0].lower()如果 len(a) >1:a[1:] = [u.title() for u in a[1:]]返回 '​​'.join(a)定义序列化(对象):返回 {snake_to_camel(k): v for k, v in obj.__dict__.items()}hp = HardwareProfile('大')打印(json.dumps(serialise(hp), indent=4, default=serialise))

输出

<代码>{"vmSize": "大",其他东西":42，一个":一个"}

你可以把serialise放在lambda中，但我认为把它写成一个合适的def更具可读性代码>函数.

I'd like to create a JSON representation of a class and change the property names automatically from snake_case to lowerCamelCase, as I'd like to comply with PEP8 in Python and also the JavaScript naming conventions (and maybe even more importantly, the backend I'm communicating to uses lowerCamelCase).

I prefer to use the standard json module, but I have nothing against using another, open source library (e.g. jsonpickle might solve my issue?).

>>> class HardwareProfile:
...     def __init__(self, vm_size):
...             self.vm_size = vm_size
>>> hp = HardwareProfile('Large')
>>> hp.vm_size
'Large'
### ### What I want ### ###
>>> magicjson.dumps(hp)
'{"vmSize": "Large"}'
### ### What I have so far... ### ###
>>> json.dumps(hp, default=lambda o: o.__dict__)
'{"vm_size": "Large"}'

解决方案

You just need to create a function to transform the snake_case keys to camelCase. You can easily do that using .split, .lower, and .title.

import json

class HardwareProfile:
    def __init__(self, vm_size):
        self.vm_size = vm_size
        self.some_other_thing = 42
        self.a = 'a'

def snake_to_camel(s):
    a = s.split('_')
    a[0] = a[0].lower()
    if len(a) > 1:
        a[1:] = [u.title() for u in a[1:]]
    return ''.join(a)

def serialise(obj):
    return {snake_to_camel(k): v for k, v in obj.__dict__.items()}

hp = HardwareProfile('Large')
print(json.dumps(serialise(hp), indent=4, default=serialise))

output

{
    "vmSize": "Large",
    "someOtherThing": 42,
    "a": "a"
}

You could put serialise in a lambda, but I think it's more readable to write it as a proper def function.

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